Questions about mineral goring

How do you identify whether something is dyed or altered (when it's not super obvious)? Relatively new to mineral collecting.

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u/nickel_teeth — 9 days ago

Keith Haring Lamborghini Temerario from Trends Hobby.

Gotten for me as a gift, I appreciate the detail of the opening panel over the engine and the suitcases under the hood.

u/nickel_teeth — 2 months ago